Oxidation Behavior Of Materials Research Articles

High temperature and short-term oxidation behavior of a TiBw/TA15 network composite in an air environment at 950 °C

The oxidation behavior of materials used in aerospace is crucial for their service life, and short-term oxidation behavior is an essential means to reveal the oxidation mechanism. The high temperature and short-term oxidation behavior of the TiBw/TA15 network composite in an air environment at 950 °C for 5 min, 15 min, 30 min, and 60 min was investigated. The experimental result indicates that the composite shows a slight mass change over the whole test times. The all-oxide scale mainly contains two-layer. From the top to the bottom of the oxide scale, an Al2O3 layer and a TiO2 layer existed, which increased with the oxidation time. The oxidation mechanism of the initial oxidation behavior of the network composite has been established, which is crucial for promoting its application in high-temperature service environments.

Experimental research on oxidation behavior when cutting Ti-5553 with cemented carbide and PCBN tools

Ti-5553, with its high strength and toughness, has been widely used in the aerospace industry as a novel aerospace alloy. High hardness, strong chemical affinity, and low thermal conductivity are the main reasons for its classification as a difficult-to-cut material. Although significant work has been performed to analyze the machinability of Ti-5553, the oxidation behavior of Ti-5553 and tool materials during the cutting process has received little attention. For this study, cemented carbide (H13A) and PCBN (BZN9000) were selected as cutting tool materials with Ti-5553 as a workpiece material. Oxidation simulation experiments were carried out in a high-temperature resistance furnace. Changes in oxidation mass gain and hardness were measured and recorded. X-ray diffraction and scanning electron microscopy were employed to detect the oxidation products and micro-morphology of the oxide layer, respectively. Based on these measurements, the oxidation behavior of the materials was analyzed and the causes of oxidative wear of the tool and workpiece materials during the cutting process were identified to provide theoretical support for Ti-5553 cutting and tool development.

Computer Simulation of Cyclic Oxidation

A computer program has been developed which simulates the cyclic oxidation behavior of materials. The simulation is based on the assumption that the weight fraction of scale that spalls in any thermal cycle is proportional to the amount of scale present on the surface at the beginning of the cycle. The program provides plots as well as tabular data which describe the cyclic oxidation behavior of a given material. Individual input parameters can be selectively altered and the resulting change in cyclic kinetics determined, allowing the user to quickly survey a wide range of cyclic conditions on the kinetics of a given material.